Home › Forum › Ask A Member › 1958 Evinrude Big Twin won’t run full throttle › Re: 1958 Evinrude Big Twin won’t run full throttle
Well, you have to figure out whether your problem is spark or fuel related…Does the engine run/rough/misfire/drop a cylinder before stalling, or does it just sounds like it is running out of gas and stalling out….Have you tried opening the high speed needle (lower one) just 1/4 turn out?
Can the engine be restarted immediately afterwards without fussing or priming the fuel tank again? You could have an assistant continually push the primer button on the fuel tank while accelerating/running at high speed to see if there might be a fuel supply/pressure tank issue.
Start with the basics, such as fresh fuel/oil supply. Water in the fuel will cause the symptom you describe. There is a little filter/bowl that should be checked also. Check the glass filter bowl for signs of dirt/water. The mesh filter element may need to be replaced. You could always try running the engine with the filter removed temporarily to see if that makes a difference.
The engine could be stalling out due to overheating, does it smoke/steam/appear hot when it quits? Are you sure you have the correct fuel/oil mix? The correct mix is 24:1 for this engine, 1 quart of TCW3 outboard oil to six gallons of regular fuel. No/not enough oil will cause the engine to seize up/stall out after running at high speeds for less than a minute.
Any chance of posting a video of the engine misbehaving?